Sharpener



FIG. 1 is a perspective view of a sharpener showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear view thereof.

The broken line showing of the circular region on the bottom of thesharpener is for environmental purposes only and forms no part of theclaimed design.

CLAIM The ornamental design for a sharpener, as shown and described.